The .bat file only sets up the VTK bin and the VTK site_packages path not the path to the virtual environment site_packages path. I actually use this file to set up those paths. numpy is in the virtual environment not the base environment in this case, this is what is causing the issue.
What is considered good practice? Should numpy, scipy matplotlib always be in the base path or should they be in only the virtual environments where needed?
Regards